<!--
 * @Author: HeAo
 * @Date: 2021-12-27 09:37:01
 * @LastEditTime: 2021-12-27 09:43:27
 * @LastEditors: HeAo
 * @Description: 
 * @FilePath: \study\day02\4-盒子模型.html
 * 别乱动！
-->
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .container {
      width: 500px;
      height: 500px;
      background-color: khaki;
    }

    .box {
      width: 300px;
      height: 300px;
      padding: 50px;
      margin: 50px;
      border: 10px solid #666;
      background-color: teal;
      box-sizing: border-box;
    }
  </style>
</head>

<body>
  <div class="container">
    <div class="box">
      hello world
    </div>
  </div>
  <!-- <div id="first"></div>
  <div>
    <div>
      <div class="box">
        <ul id="second"></ul>
      </div>
    </div>
  </div> -->
</body>

</html>